This example shows the functionality of "Long-term optical tracking API"-- pause
video [p] and draw a bounding box around the target to start the tracker
Example of <video_name> is in opencv_extra/testdata/cv/tracking/
Call:
./tracker <tracker_algorithm> <video_name> <start_frame> [<bounding_frame>]

Hot keys:
q - quit the program
p - pause video

But I have not found the opencv_extra/testdata/cv/tracking.Could you tell me the command in details to run it on the cmdline?